Lamp base



FIG. 1 is a perspective view of a lamp base comprising the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a front view of a second embodiment of a lamp base comprisingthe new design, shown having indeterminate height; and,

FIG. 5 is a front view of a third embodiment of a lamp base comprisingthe new design, shown having an opaque surface.

The broken lines in the figures are for illustrative purposes only andform no part of the claimed invention.

The ornamental design for the lamp base, as shown and described.